Anatomy Review: Skeletal Muscle Tissue

Study Questions on Anatomy Review: Skeletal Muscle Tissue

1. What is the main function of skeletal muscles?

2. List the three types of contractile cells of the body.

3. Match the following types of contractile cells to their shape (branching, elongated, spindle-shaped):

___________________ a. Skeletal muscle cells

___________________ b. Cardiac muscle cells

___________________ c. Smooth muscle cells

4. Match the following types of contractile cells to the characteristics of their nuclei and presence or absence of striations:

Cardiac Muscle Cells          Smooth Muscle Cells               Skeletal Muscle Cells

___________________ a. presence of visible striations & single, centrally-located nuclei

___________________ b. presence of visible striations & multiple peripheral nuclei

___________________ c. absence of visible striations & single, centrally-located nuclei number of nuclei

5. What is the name of the structure that attaches skeletal muscles to bones?

6. Bundles of skeletal muscle cells are called ________________.

7. The connective tissue which immediately surrounds a muscle is called _______________ and the connective tissue around the fascicles is called ________________.

8. Match these terms to their description:

T tubules

Terminal cisternae

Sarcolemma

Muscle fibers 

Mitochondria

Sarcoplasmic reticulum

Myofibril

___________________   a. Sac-like regions of the sarcoplasmic reticulum that contain calcium ions. 

___________________   b. Sites of ATP synthesis.

___________________   c. Plasma membrane of the muscle cell.

___________________   d. Alternative  name for skeletal muscle cells.

___________________   e. Interconnecting tubules of endoplasmic reticulum that surround each myofibril.

___________________   f. Invaginations of the sarcolemma that project deep into the cell.

___________________   g.. Contains the contractile filaments within the skeletal muscle cell.

9. What are the names for the two types of filament in a myofibril?

10.What creates the skeletal muscle cell's striated appearance?

11. Match the following:

A band                  I band                   H zone

______________ a. Contains only thin filaments.

______________ b. Contains only thick filaments.

______________ c. Contains both thin and thick filaments.

12. Perpendicular to the myofilaments are the Z lines.  The Z lines connect the _____________ filaments.

13. The region of the myofibril between two Z lines that is the contractile unit of a muscle cell is called a _____________ .

14. Arrange the following from smallest structure to largest structure:

Muscle cell or muscle fiber

Fascicle

Myofilaments

Whole skeletal muscle

Myofibril